文献类型： 外文期刊
作者： Feng, Maomao 1 ; Adams, Jonathan M. 3 ; Fan, Kunkun 1 ; Shi, Yu 1 ; Sun, Ruibo 4 ; Wang, Daozhong 5 ; Guo, Xisheng 6 ; Ch 1 ;
作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Cranfield Univ, Sch Water Energy & Environm, Cranfield MK46 0AL, Beds, England
4.Chinese Acad Sci, Inst Genet & Dev Biol, Key Lab Agr Water Resources, Hebei Lab Agr Water Saving,Ctr Agr Resources Res, Shijiazhuang, Hebei, Peoples R China
5.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, South Nongke Rd 40, Hefei 230031, Anhui, Peoples R China
6.Anhui Acad Agr Sci, Soil & Fertilize
关键词： Soil diazotrophs; Community assembly; Chemical fertilizer; Livestock manure
期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）
ISSN： 0038-0717
年卷期： 2018 年 126 卷
页码：
收录情况： SCI
摘要： Unraveling the drivers of microbial community variation in response to different environmental conditions is a major goal in ecology. Although diazotrophs play a dominant role in global biological nitrogen (N-2) fixation, the controls on soil diazotrophic community assembly are not fully understood. In this study, we investigated soil diazotrophic communities in field plots that received long-term (30 years) fertilization treatments with Illumina MiSeq sequencing. Long-term chemical fertilization significantly changed soil diazotrophic community structure and resulted in the decrease of diazotrophic diversity, while the addition of livestock manure could maintain the diversity. Diazotrophic community structure and diversity were mostly correlated with soil pH. Deterministic processes structured diazotrophic communities in both unfertilized and fertilized soils. However, the deterministic selection on phylogenetically non-conserved traits increased phylogenetic randomness in all fertilized treatments. These trends for diazotrophs differed from those for the entire bacterial community, which was structured through deterministic processes and exhibited phylogenetic nonrandomness in unfertilized and fertilized soils. Taken together, our results indicated that long-term fertilization strongly affected the diversity, community structure and assembly processes of soil diazotrophs, which may have implications for the rate of biological N-2 fixation in agricultural systems.
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